1f7d250182
no longer contains kernel specific data structures, but rather only scalar values and structures that are already part of the kernel/user interface, specifically rusage and rtprio. It no longer contains proc, session, pcred, ucred, procsig, vmspace, pstats, mtx, sigiolst, klist, callout, pasleep, or mdproc. If any of these changed in size, ps, w, fstat, gcore, systat, and top would all stop working. The new structure has over 200 bytes of unassigned space for future values to be added, yet is nearly 100 bytes smaller per entry than the structure that it replaced.
125 lines
4.0 KiB
C
125 lines
4.0 KiB
C
/*-
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* Copyright (c) 1990, 1993
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* The Regents of the University of California. All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. All advertising materials mentioning features or use of this software
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* must display the following acknowledgement:
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* This product includes software developed by the University of
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* California, Berkeley and its contributors.
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* 4. Neither the name of the University nor the names of its contributors
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* may be used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*/
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#ifndef lint
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#if 0
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static char sccsid[] = "@(#)proc_compare.c 8.2 (Berkeley) 9/23/93";
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#endif
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static const char rcsid[] =
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"$FreeBSD$";
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#endif /* not lint */
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#include <sys/param.h>
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#include <sys/time.h>
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#include <sys/user.h>
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#include "extern.h"
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/*
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* Returns 1 if p2 is "better" than p1
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*
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* The algorithm for picking the "interesting" process is thus:
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*
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* 1) Only foreground processes are eligible - implied.
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* 2) Runnable processes are favored over anything else. The runner
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* with the highest cpu utilization is picked (p_estcpu). Ties are
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* broken by picking the highest pid.
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* 3) The sleeper with the shortest sleep time is next. With ties,
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* we pick out just "short-term" sleepers (P_SINTR == 0).
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* 4) Further ties are broken by picking the highest pid.
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*
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* If you change this, be sure to consider making the change in the kernel
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* too (^T in kern/tty.c).
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*
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* TODO - consider whether pctcpu should be used.
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*/
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#define ISRUN(p) (((p)->ki_stat == SRUN) || ((p)->ki_stat == SIDL))
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#define TESTAB(a, b) ((a)<<1 | (b))
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#define ONLYA 2
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#define ONLYB 1
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#define BOTH 3
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int
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proc_compare(p1, p2)
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struct kinfo_proc *p1, *p2;
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{
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if (p1 == NULL)
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return (1);
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/*
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* see if at least one of them is runnable
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*/
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switch (TESTAB(ISRUN(p1), ISRUN(p2))) {
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case ONLYA:
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return (0);
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case ONLYB:
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return (1);
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case BOTH:
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/*
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* tie - favor one with highest recent cpu utilization
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*/
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if (p2->ki_estcpu > p1->ki_estcpu)
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return (1);
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if (p1->ki_estcpu > p2->ki_estcpu)
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return (0);
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return (p2->ki_pid > p1->ki_pid); /* tie - return highest pid */
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}
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/*
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* weed out zombies
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*/
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switch (TESTAB(p1->ki_stat == SZOMB, p2->ki_stat == SZOMB)) {
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case ONLYA:
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return (1);
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case ONLYB:
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return (0);
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case BOTH:
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return (p2->ki_pid > p1->ki_pid); /* tie - return highest pid */
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}
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/*
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* pick the one with the smallest sleep time
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*/
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if (p2->ki_slptime > p1->ki_slptime)
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return (0);
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if (p1->ki_slptime > p2->ki_slptime)
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return (1);
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/*
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* favor one sleeping in a non-interruptible sleep
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*/
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if (p1->ki_flag & P_SINTR && (p2->ki_flag & P_SINTR) == 0)
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return (1);
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if (p2->ki_flag & P_SINTR && (p1->ki_flag & P_SINTR) == 0)
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return (0);
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return (p2->ki_pid > p1->ki_pid); /* tie - return highest pid */
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}
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